arrays.js
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"use strict";
/* Array utilities. */
var arrays = {
range: function(start, stop) {
var length = stop - start,
result = new Array(length),
i, j;
for (i = 0, j = start; i < length; i++, j++) {
result[i] = j;
}
return result;
},
find: function(array, valueOrPredicate) {
var length = array.length, i;
if (typeof valueOrPredicate === "function") {
for (i = 0; i < length; i++) {
if (valueOrPredicate(array[i])) {
return array[i];
}
}
} else {
for (i = 0; i < length; i++) {
if (array[i] === valueOrPredicate) {
return array[i];
}
}
}
},
indexOf: function(array, valueOrPredicate) {
var length = array.length, i;
if (typeof valueOrPredicate === "function") {
for (i = 0; i < length; i++) {
if (valueOrPredicate(array[i])) {
return i;
}
}
} else {
for (i = 0; i < length; i++) {
if (array[i] === valueOrPredicate) {
return i;
}
}
}
return -1;
},
contains: function(array, valueOrPredicate) {
return arrays.indexOf(array, valueOrPredicate) !== -1;
},
each: function(array, iterator) {
var length = array.length, i;
for (i = 0; i < length; i++) {
iterator(array[i], i);
}
},
map: function(array, iterator) {
var length = array.length,
result = new Array(length),
i;
for (i = 0; i < length; i++) {
result[i] = iterator(array[i], i);
}
return result;
},
pluck: function(array, key) {
return arrays.map(array, function (e) { return e[key]; });
},
every: function(array, predicate) {
var length = array.length, i;
for (i = 0; i < length; i++) {
if (!predicate(array[i])) {
return false;
}
}
return true;
},
some: function(array, predicate) {
var length = array.length, i;
for (i = 0; i < length; i++) {
if (predicate(array[i])) {
return true;
}
}
return false;
}
};
module.exports = arrays;