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Copy pathindex.js
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93 lines (85 loc) · 2.75 KB
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var test = require('../util/test')(__filename);
var curry = require('../../packages/function-curry');
test('converts n-ary function to a sequence of nested unary functions', function(t) {
t.plan(13);
function addThree(x, y, z) {
return x + y + z;
}
var curryAddThree = curry(addThree);
t.equal(typeof curryAddThree(3), 'function');
t.equal(typeof curryAddThree(3, 2), 'function');
t.equal(typeof curryAddThree(3, 2, 5), 'number');
t.equal(typeof curryAddThree(3)(5)(4), 'number');
t.equal(curryAddThree(3, 2, 5), 10);
t.equal(curryAddThree(3)(5)(4), 12);
var addTwoTo2 = curry(addThree)(2);
t.equal(typeof addTwoTo2(3), 'function');
t.equal(typeof addTwoTo2(3)(6), 'number');
t.equal(typeof addTwoTo2(3, 6), 'number');
t.equal(addTwoTo2(5)(8), 15);
t.equal(addTwoTo2(13, 21), 36);
t.equal(curry(addThree)(34)(55)(89), 178);
function converter(ratio, input) {
return (input * ratio).toFixed(1);
}
var curriedConverter = curry(converter);
var milesToKm = curriedConverter(1.62);
t.equal(milesToKm(35), '56.7');
t.end();
});
test('supports arity override argument', function(t) {
t.plan(5);
function add(/* infinite number args */) {
var args = [].slice.call(arguments);
return args.reduce(function(sum, n) {
return sum + n;
}, 0);
}
var curryAdd4 = curry(add, 4);
t.equal(typeof curryAdd4(3), 'function');
t.equal(typeof curryAdd4(3)(1, 4), 'function');
t.equal(typeof curryAdd4(3)(1, 4)(2), 'number');
t.equal(curryAdd4(5)(8)(2)(7), 22);
t.equal(curryAdd4(5)(8, 4)(7), 24);
t.end();
});
test('accepts arguments exceeding arity', function(t) {
t.plan(2);
function add(/* infinite number args */) {
var args = [].slice.call(arguments);
return args.reduce(function(sum, n) {
return sum + n;
}, 0);
}
var curryAdd4 = curry(add, 4);
t.equal(typeof curryAdd4(3)(1, 4)(2, 5), 'number');
t.equal(curryAdd4(3)(1, 4)(2, 5), 15);
t.end();
});
test('does not bind supplied arguments', function(t) {
t.plan(3);
function converter(ratio, input) {
return (input * ratio).toFixed(1);
}
var milesToKm = curry(converter, 1.62);
t.equal(typeof milesToKm(35), 'function');
t.equal(milesToKm(1.62)(10), '16.2');
t.equal(milesToKm(1.62, 10), '16.2');
t.end();
});
test('still returns a function for zero-arity functions', function(t) {
t.plan(2);
function nothing() {}
t.equal(typeof curry(nothing), 'function');
t.equal(typeof curry(nothing, 1, 2, 3), 'function');
});
test('executes in the correct context', function(t) {
t.plan(2);
function converter(ratio, input) {
return (input * ratio).toFixed(this.dps);
}
var milesToKm = curry(converter)(1.62);
t.equal(milesToKm.call({dps: 0}, 35), '57');
t.equal(milesToKm.call({dps: 2}, 35), '56.70');
t.end();
});